Not at all, Jacob. We are talking about two entirely different operating systems (superficial similarities nothwithstanding). I would consider it strange if things like OS-level keyboard shortcuts were the same. I do not expect Apple and Microsoft OS developers talk to each other in hopes of achieving UI uniformity.

While on this topic, there are other differences between the platforms:

The Option+8 shortcut in Mac OS works only with the 'regular' number 8 key, not the '8' on the numeric keypad. (The same goes for other similar 'special' characters.)

The Alt+7 or Alt+0149 shortcut in Windows works only with the numeric keypad, not the 'regular' number keys. (The same goes for other Alt+ shortcuts.)

The Option+ shortcuts in Mac OS insert the character immediately upon keypress.

The Alt+ shortcuts in Windows insert the character only upon release of the Alt key.